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pH‐ and Voltage‐Switchable Superhydrophobic Surfaces by Electro‐Copolymerization of EDOT Derivatives Containing Carboxylic Acids and Long Alkyl Chains
Author(s) -
Darmanin Thierry,
Guittard Frederic
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201300283
Subject(s) - monomer , alkyl , carboxylic acid , copolymer , carboxylate , electrochemistry , polymer , polymer chemistry , materials science , chemistry , organic chemistry , electrode
In order to produce pH‐ and voltage‐switchable superhydrophobic surfaces, PEDOT derivatives containing various proportions of a EDOT monomer containing carboxylic groups (EDOTCOOH) and EDOT monomer‐containing dodecyl chains (EDOTOH 12 ) are elaborated. The surface morphology and roughness depend highly on the proportion of the monomers. Superhydrophobic properties are reached for a mol % of EDOTCOOH between 0 and 25 %. It is possible to switch from superhydrophobic to hydrophilic ( θ water until about 45°) by electrochemical reduction at low voltage (−1 V vs SCE) to remove the doping anions, following by treatment with NaOH to change the carboxylic groups into carboxylate. By elaborating smooth surfaces of each polymer, the effect of each treatment is reported. The reversibility of the reactions is also reported.